Geometry

Question Analysis:  
This question asks you to identify triangle types by side lengths or slopes.  
The main focus is detecting right angles using slopes or Pythagoras.

Key Concept Explanation:  
Triangles are classified by:
Side lengths:
Scalene: All sides unequal
Isosceles: Two sides equal
Equilateral: All sides equal
Angles:
Right: One angle is 90°

Step-by-Step Solution:  
- Find distances:  
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